Sharpening-machine for drill-bits.



No. 807,128. PATENTED DEC. 12, 1905.

T. H. PROSKE.

SHARPENING MACHINE FOR. DRILL BITS. APPLIOATION FILED JAN. 24, 1905.

' 2 sums-sum 1.

A TTORN E Y8 PATENTED DEC. 12, 1905.

T. H. PROSKE.

SHARPBNING MACHINE FOR DRILL BITS.

APPLICATION FILED 3,513.24. 1905.

2 SHEETS-SHEET 2.

ATTORNEYS UNITED sATEs PATENT ()FFTCF.

THEODORE H. PROSKE, OF DENVER, COLORADO.

SHARPENlNG-NIACHINE FOR DRILL-BITS.

Specification of Letters Patent.

Patented Dec. 12, 1905.

Application fil January 24, 1905. Serial No. 242,517.

.To all whom it may concern:

Be it known that I, THEODORE H. PROsKE,

a citizen of the United States, and a resident vide a new and improved sharpening-machinefor drill-bits arranged to permit of sharpening various sizes of drills in a single pair of dies by the use of different-sized dollies, the sharpened drills being accurate and regular both in gage and form to insure the drilling of straight holes without danger ofthe drill sticking in the hole.

The invent-ion consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and then pointed out in the claim.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corre sponding parts in all the views.

Figure 1 is a side elevation of the improvement, parts being broken out. Figs. 2, 3, and 4 are enlarged side elevations of a set of dol-' lies to be used in the machine. Fig. 5 is an enlarged face view of the sectional die in position in the guideways of the machine. Fig. 6 is a plan view-of the lower die. Fig. 7 is an inverted plan view of the upper die. Fig. 8 is a longitudinal sectional elevation of the lower die, the section being on the line 8 8 of Fig. 6. Fig. 9 is a similar view of the same on the line 9 9 of Fig. 6, and Fig. 10 is a side elevation of the drill-bit.

On a suitably-constructed bed or frame A is held a vertically-disposed guideway B, in which fit'dies C and C in the form of blocks and of which the lower or anvil die C is removably held on a suitable support D, extending between the sides of the guideway B, as plainly indicated in Fig. 5. The upper or hammer die 0' is removably held on a crosshead E, mounted to slide vertically in the guideway B and connected with the piston-rod F of a pneumatic or other hammer F of any approved construction and employed for imparting a reciprocating motion to the hammerdie G or to hold the latter in a closed position on top of the anvil-die C during the time the cutting edges of the drill-bits are sharpened, as hereinafter more fully described.

The dies 0 and C are provided in their opposite faces with longitudinally-extending registering recesses C C and C C for receiving and carrying the bit of the drill G, the rear end of the shank of which is adapted to rest on an abutment-block H, mounted to slide longitudinally on the bed A. The

abutment-block H is provided with a fixednut H, in which screws a screw-rod 1, extending longitudinally and journaled in suitable bearings carried by the bed A. The for- Ward end of the screw-rod I is connected by a gearing I with a transverse shaft 1 journaled in the bed A and carrying at its outer end a crank-arm 1 under the control of the operator for turning the shaft 1 to rotate the screw-rod I with a view to moving the abutment-block H forward or backward, according to the length of the shank of the tool under treatment at the time.

The registering recesses G C are each V- shaped in cross-section and taper from the front ends of the dies C G to the rear ends thereof, as plainly indicated in Figs. 6 and 7, the object being to allow sharpening different-sized drill-bits in the same die-blocks that is, a large-sized bit fits the recesses C G at or near to the front end thereof, while smaller-sized bits fit farther to the rear in the recesses.

The bits are acted on while in position in the registering recesses C C? by dollies having their heads of diiferent tapers to allow the heads to enter the forward ends of the recesses 0 according to the size of the drillbit in position at the time in the recesses C C of the dies O 0. Thus for a large-sized drill held in the forward end of the recesses O C a dolly J is used, such as shown in Fig. 2,the head J of which fits the forward end of the said recesses. When a tool with a medium-sized drill-bit is held in the registering recesses C C of the dies C C, then a dolly J having a head J such as shown in Fig. 3, is used, as this head so tapers as to fit into the forward end of the registering recesses to act on the bit in position in the dies at the time. In a like manner a small-sized bit is acted on by a dolly J, having a tapering head J such as shown in Fig. 4: and somewhat longer than the head shown in the dolly represented in Fig. 3 to allow this dolly to enter the registering recesses C C a considerable distance in order to strike the cutting edges of the small-sized bit in position in the dies C C at the time.

Each of the dollies is adapted to be connected with the piston-rod K of a pneumatic or other hammer K, mounted on a support L, held on the bed A, the said support L being also provided with a bearing L for the dolly J to slide in.

The registering recesses (1* C in the dies C C are for cross-forming purposes, and when a drill-bit is in position in the lower recess C and the upper die C is caused to reciprocate by the action of the hammer F then the drill-bit is cross-formed in the usual manner, it being understood that the recesses (J C have tapering bottoms, as indicated in Fig. 8, to allow of cross-forming different-sized drillbits. The lower die C is provided at its forward end with a stop 0, extending transversely across the forward end of the recess (3* to limit the movement of the drillbit when inserted in the lower recess (1* at the time the upper die C is in raised position.

It is understood that when the drill-bit is in the cross-forming recesses (1* G the upper die C is reciprocated; but when the drill-bit is in position in the registering recesses C C then the upper die C is held in a lowermost position-that is, on top of the anvil-die O during the time the corresponding dolly is active-that is, reciprocated from the hammer Kto sharpen the cutting edges of the drill-bit.

It is understood that the width of the drill is reduced the farther back it is held while being hammered in the recesses C C and it will be noted that these recesses 0* C correspond in taper with the recesses C for upsetting the drill in, and by drawing the drill back the endof the drill is hammered down to the required width before it is placed into the upsetting recesses 0 C Suitable means are employed to enable the operator in charge to stop and start the hammers F and K, according to the nature of the work under treatment at the time; but as such means are of ordinary construction it is not deemed necessary to further illustrate or describe the same.

It is understood that by the use of the Inachine the drills are side-set and cross-formed while held in the recesses C C and while the hammer-die is reciprocated, the latter forging the cross-form and at the same time forming the bevel or cutting edge on the face of the drill and the taper or clearance. After this operation the drill is upset or its cutting edges sharpenedthat is, the drill is placed into the recesses O C with the hammer-die C held in a closed position and the corresponding dolly reciprocating by the action of the hammer K to upset the forward or cutting end of the drill-bit. Drills sharpened by this machine are regular in gage and form and capable of drilling straight holes without danger of the drills sticking in the holes.

Having thus described my invention, Iclaim as new and desire to secure by Letters Patent- A sharpening-machine for drill-bits, provided with a pair of dies, each having a V- shaped recess in its working face, the recesses registering with each other and tapering from the front ends of the dies to the rear ends thereof, whereby provision is made for bolding different-sized drill-bits in the same recesses of thedies with their ends at varying distances from the front ends of the dies according to size, and a dolly having atapering head for entering the recesses of the dies to upset or sharpen the bits, the taper of the head of the dolly corresponding to the taper of the recesses and the head being of a length to enter the recesses of the dies a distance equal to the distance the bit is held within the said recesses according to the size of bit.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THEODORE H. PROSKE.

Witnesses:

HENRY EGGERS, FRANK B. MOFARLANE. 

